Updating routing information based on client location

1. A computer-implemented method comprising:

obtaining a first DNS query from a client computing device at a first DNS server, wherein the first DNS query corresponds to a first requested resource and wherein the first DNS server corresponds to a content delivery network service;

obtaining a query IP address associated with the first DNS query at the first DNS server, wherein the query IP address is associated with the client computing device;

obtaining, at the first DNS server from a routing data store, a location-based identifier at least based on a portion of the obtained query IP address, wherein the routing data store includes at least one partial IP address to location-based identifier mapping;

resolving the first DNS query based on the location-based identifier;

collecting performance data associated with transmission of the first requested resource; and

modifying the routing data store based on the performance data with an updated location-based identifier associated with the query IP address.

2. The method as recited in claim 1 , wherein the query IP address being associated with the client computing device comprises the query IP address corresponding to a local DNS resolver of the client computing device.

3. The method as recited in claim 1 , wherein the location-based identifier is different from the obtained query IP address associated with the first DNS query.

4. The method as recited in claim 1 , wherein obtaining the location-based identifier comprises matching a portion of the query IP address with a partial IP address identified in the at least one partial IP address to location-based identifier mapping in the routing data store.

5. The method as recited in claim 1 , wherein the routing data store includes a full IP address to location-based identifier mapping, and wherein obtaining the location-based identifier comprises matching a portion of the query IP address with a portion of the full IP address identified in the full IP address to location-based identifier mapping in the routing data store.

6. The method as recited in claim 1 , wherein the routing data store includes a full IP address to location-based identifier mapping, and wherein obtaining the location-based identifier comprises partially matching the query IP address with a full IP address identified in the full IP address to location-based identifier mapping in the routing data store.

7. The method as recited in claim 1 , wherein the updated location-based identifier is determined based on user profile information associated with the client computing device.

8. The method as recited in claim 7 , wherein the updated location-based identifier corresponds to an alternative billing address associated with the client computing device.

9. The method as recited in claim 7 , wherein the updated location-based identifier corresponds to a shipping address associated with the client computing device.

10. The method as recited in claim 1 , wherein modifying the routing data store comprises adding a new entry to the routing data store mapping the query IP address to an updated location-based identifier.

11. The method as recited in claim 1 , wherein modifying the routing data store comprises modifying an existing location-based identifier to at least partial IP address mapping entry with an updated location-based identifier.

12. A computer-implemented method comprising:

obtaining a first DNS query from a client computing device at a first DNS server, wherein the first DNS query corresponds to a first requested resource and wherein the first DNS server corresponds to a content delivery network service;

obtaining a query IP address associated with the first DNS query at the first DNS server, wherein the query IP address is associated with the client computing device;

obtaining, at the first DNS server from a routing data store, a location-based identifier at least based on a portion of the obtained query IP address, wherein the location-based identifier corresponds to location information associated with the client computing device, and wherein the routing data store further includes location-based identifier to destination identifier mappings, wherein a destination identifier corresponds to a geographic region associated with the content delivery network service from which the first requested resource can be resolved; and

resolving the first DNS query based on the location-based identifier.

13. The method as recited in claim 12 , wherein the location-based identifier is different from the obtained query IP address associated with the first DNS query.

14. The method as recited in claim 12 , wherein the query IP address being associated with the client computing device comprises the query IP address corresponding to a local DNS resolver of the client computing device.

15. The method as recited in claim 12 further comprising:

collecting performance data associated with transmission of the first requested resource; and

updating routing information in the routing data store associated with the query IP address based on the performance data.

16. The method as recited in claim 15 , wherein the routing data store includes at least one partial IP address to location-based identifier mapping.

17. The method as recited in claim 16 , wherein the at least partial IP address to location-based identifier mappings each have a corresponding confidence factor.

18. The method as recited in claim 17 , wherein updating routing information in the routing data store comprises updating the confidence factor corresponding to the at least partial IP address to location-based identifier mapping associated with the query IP address.

19. The method as recited in claim 15 , wherein updating routing information in the routing data store comprises modifying the routing data store with an updated destination identifier corresponding to the location-based identifier associated with the query IP address.

20. The method as recited in claim 12 , wherein the routing data store further includes network points of presence mappings to at least one of the location-based identifiers and the destination identifiers.

21. The method as recited in claim 20 , wherein updating routing information in the routing data store comprises modifying the routing data store with an updated network point of presence mapping.

22. A computer system comprising:

a routing data store including at least one partial IP address to location-based identifier mapping; and

a first network point of presence associated with a content delivery network service provider, wherein the first network point of presence comprises at least one computing device and is operable to:

obtain a first DNS query from a client computing device at a first DNS server, wherein the first DNS query corresponds to a first requested resource and wherein the first DNS server corresponds to a content delivery network service;

obtain a query IP address associated with the first DNS query at the first DNS server, wherein the query IP address is associated with the client computing device;

obtain, at the first DNS server from the routing data store, a location-based identifier at least based on a portion of the obtained query IP address, wherein the location-based identifier corresponds to location information associated with the client computing device, and wherein the routing data store further includes location-based identifier to destination identifier mappings, wherein a destination identifier corresponds to a geographic region associated with the content delivery network service from which the first requested resource can be resolved; and

resolve the first DNS query based on the location-based identifier.

23. The system as recited in claim 22 , wherein the location-based identifier is different from the obtained query IP address associated with the first DNS query.

24. The system as recited in claim 22 , wherein the query IP address being associated with the client computing device comprises the query IP address corresponding to a local DNS resolver of the client computing device.

25. The system as recited in claim 22 , wherein obtaining the location-based identifier comprises matching a portion of the query IP address with a partial IP address identified in the at least one partial IP address to location-based identifier mapping in the routing data store.

26. The system as recited in claim 22 , wherein the routing data store includes a full IP address to location-based identifier mapping, and wherein obtaining the location-based identifier comprises matching a portion of the query IP address with a portion of the full IP address identified in the full IP address to location-based identifier mapping in the routing data store.

27. The system as recited in claim 22 , wherein the routing data store includes a full IP address to location-based identifier mapping, and wherein obtaining the location-based identifier comprises partially matching the query IP address with a full IP address identified in the full IP address to location-based identifier mapping in the routing data store.